Bellamy Blake's high-stakes mission inside Mount Weather to rescue Zara kom Trikru, the elite assassin sister of Commander Lexa. Kept under heavy sedation due to her lethal combat skills, Zara is the key to a crucial alliance between the Sky People and the Grounder coalition. After Bellamy and Maya successfully infiltrate her high-security containment unit and stop the sedative drip, Bellamy must navigate a dangerous escape alongside a fiercely independent warrior who holds the fate of both their peoples in her hands.